org/openmrs/messagesource/impl/MutableResourceBundleMessageSource.java

properties files are now in api jar files which cannot be modified. TRUNK-4097

We should therefore remove this method implementation or stop claiming that we are a mutable resource.

OpenmrsUtil.storeProperties(props, propertyFile.getInputStream(), "OpenMRS Application Messages");

Location:

https://github.com/openmrs/openmrs-core/blob/2.2.0/api/src/main/java/org/openmrs/messagesource/impl/MutableResourceBundleMessageSource.java#L211